Electric air door of air-cooled refrigerator
By using a rigid conductive plastic open frame to match and connect with the air vent edge in the electric damper of the air-cooled refrigerator, the problem of frost buildup on the damper is solved, achieving low-cost, high-efficiency defrosting and automated production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2026-03-10
AI Technical Summary
Existing electric frost doors in air-cooled refrigerators frost up in humid environments, preventing them from opening and closing properly. Furthermore, existing defrosting mechanisms are difficult to install, costly, and difficult to automate.
A rigid conductive plastic open square frame is used as the heating substrate. It is injection molded and matched with the air vent edge. The frame strip is straight and made of conductive ABS plastic material coated with insulating paint. The frame strip is fixed in the air damper cavity by positioning pins and protrusions.
It has a simple structure, quick assembly, low production cost, high operational reliability, is easy to automate production, has a good defrosting effect, and meets the national standard drop test requirements.
Smart Images
Figure CN223985448U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to air-cooled refrigerator technical field, especially air-cooled refrigerator electric air door. BACKGROUND
[0002] Air-cooled refrigerator electric air door is installed in air-cooled control channel, and the supply of cold air is regulated by controlling the opening and closing of air door.
[0003] The defrosting structure of the prior air-cooled refrigerator electric air door is to set silica gel heating wire outside the joint of air door and surrounding edge, which is a flexible part, difficult to install, high in manufacturing cost, and difficult to realize production automation. UTILITY MODEL CONTENTS
[0004] The utility model provides a kind of air-cooled refrigerator electric air door, it is provided with hard conductive plastic open square frame outside the air port surrounding edge contacted and connected with air door, the hard conductive plastic open square frame is made of conductive ABS plastic material as heating base material and is formed by injection molding, each section frame strip of the open square frame is straight line, and it is matched with air port surrounding edge and is contacted and connected, so, simple structure, assembly fast, high reliability, low in production cost, high efficiency, and easy to realize production automation.
[0005] The utility model discloses a technical solution is such: a kind of air-cooled refrigerator electric air door, including air door and air door frame, the rectangular air port is equipped in the lower central part of air door frame, the air port is equipped with the surrounding edge consisting of two opposite long surrounding edges and two opposite short surrounding edges, air door and the surrounding edge top matching contact connection are connected, the air port upper end short surrounding edge outside air door frame on the side of the baffle and vertical cylindrical first convex column and respectively located the first positioning pin, second positioning pin of the baffle two sides, vertical cylindrical second convex column is equipped on the air door frame in the left side long surrounding edge middle outside, vertical cylindrical third convex column is equipped in the right end of lower short surrounding edge with the right end of the right side long surrounding edge intersection, and hard conductive plastic open square frame that the surrounding edge shape matching contact connection is also equipped in the surrounding edge outside, the opening part of the hard conductive plastic open square frame is equipped with the first connecting part with first terminal and the second connecting part with second terminal, the hard conductive plastic open square frame is positioned and fixed in the cavity formed by first convex column, second convex column, third convex column and baffle, first positioning pin, second positioning pin by first convex column, second convex column, third convex column and air port surrounding edge, the frame strip that the hard conductive plastic open square frame and the surrounding edge corresponding matching contact connection are all linear, and first thimble that the second convex column matching sleeve joint is equipped in the middle of second segment frame strip, second thimble that the third convex column matching sleeve is equipped in the intersection of third segment frame strip and fourth segment frame strip, the hard conductive plastic open square frame is integrally injection moulded using conductive ABS plastic material.
[0006] The frame strip of the hard conductive plastic open square frame is in the shape of a square bar, and the first connecting part and the second connecting part are both in the shape of a flat plate; the cross-sectional area of the first connecting part and the second connecting part is 1.5-2 times larger than the cross-sectional area of the frame strip of the hard conductive plastic open square frame.
[0007] The outer surface of the hard conductive plastic open square frame is coated with a layer of insulating paint.
[0008] Compared with the prior art, the utility model has the following beneficial effects:
[0009] (1) The utility model adopts conductive ABS plastic material as the heating base material of the hard conductive plastic open square frame, and can be made into a hard open square frame matched with the surrounding edge of the air port through injection molding. Since the frame strip is linear, the structure is simple, the manufacturing process and assembly are simple, the reliability is higher, the production cost is low, the production efficiency is high, and the production automation can also be realized.
[0010] (2) the hard conductive plastic open square frame is provided with a first sleeve 2-2-1 in the middle of the second frame strip 2-2, provided with a second sleeve 2-3-1 at the intersection of the third and fourth frame strips 2-3, 2-4, and positioned and fixed in the cavity outside the surrounding edge through the first convex column, the partition, the second convex column, the first and second sleeves and the third convex column, so that the operation is convenient, reliable and efficient, and is beneficial to the automation of the production process. BRIEF DESCRIPTION OF DRAWINGS
[0011] Figure 1 is a structural schematic diagram of the electric air door of the air-cooled refrigerator, and the air door is not shown in the drawing.
[0012] Figure 2 is Figure 1 A-A sectional view schematic diagram.
[0013] Figure 3 is Figure 1 B-B sectional view schematic diagram.
[0014] Figure 4 is Figure 1 the hard conductive plastic open square frame structure schematic diagram shown in the figure. DETAILED DESCRIPTION
[0015] The utility model will be further described in detail through the following examples.
[0016] Referring to Figures 1 to 4As shown, an electric air damper for a frost-free refrigerator includes an air damper and an air damper frame 1. A rectangular air vent 1-1 is located at the center of the lower part of the air damper frame 1. The air vent 1-1 has a surrounding edge 1-2 composed of two opposing long surrounding edges 1-2-1 and two opposing short surrounding edges 1-2-2. The air damper is matched and connected to the top of the surrounding edge 1-2. A partition 1-5 and a vertically placed cylindrical first protrusion 1-6 are provided on the air damper frame 1 next to the outer side of the short surrounding edge 1-2-2 at the upper end of the air vent 1-1. The first positioning pin 1-3 and the second positioning pin 1-4 are located on both sides of the partition 1-5. A vertically placed cylindrical second protrusion 1-7 is provided on the damper frame 1 next to the middle outer side of the left long perimeter 1-2-1. A vertically placed cylindrical third protrusion 1-8 is provided at the intersection of the lower end of the right long perimeter 1-2-1 and the right end of the lower short perimeter 1-2-2. A rigid conductive plastic open frame 2, matching the shape of the perimeter 1-2, is also provided on the outer side of the perimeter 1-2. The opening portion of the conductive plastic opening frame 2 is provided with a first connecting part 2-5 with a first terminal 3-1 and a second connecting part 2-6 with a second terminal 3-2. The rigid conductive plastic opening frame 2 is positioned and fixed between the first protrusion 1-6, the second protrusion 1-7, the third protrusion 1-8 with umbrella-shaped barbs, as well as the partition 1-5, the first positioning pin 1-3, and the second positioning pin 1-4. Within the formed cavity, the rigid conductive plastic open square frame 2 and the corresponding matching and contacting frame strips of the surrounding edge 1-2 are all straight, and a first collar 2-2-1 that matches and is connected to the second protrusion 1-7 is provided in the middle of the second frame strip 2-2, and a second collar 2-3-1 that matches and is connected to the third protrusion 1-8 is provided at the intersection of the third frame strip 2-3 and the fourth frame strip 2-4; the rigid conductive plastic open square frame 2 is integrally injection molded from conductive ABS plastic material.
[0017] The rigid conductive plastic open square frame 2 has a square frame, and the first connecting part 2-5 and the second connecting part 2-6 are both flat. The cross-sectional area of the first connecting part 2-5 and the second connecting part 2-6 is 1.5 to 2 times larger than the cross-sectional area of the frame of the rigid conductive plastic open square frame 2.
[0018] The outer surface of the rigid conductive plastic open frame 2 is coated with a layer of insulating varnish.
[0019] The damper frame 1 is made of plastic injection molding, and the first terminal 3-1 and the second terminal 3-2 are both made of metal, such as copper.
[0020] The heating substrate of the rigid conductive plastic open frame 2 is made of conductive ABS plastic material with a resistivity ρ = 3.5 × 10⁻⁶. -3Ω·m; The working voltage of the rigid conductive plastic open square frame 2 is DC12V, and its power is 1W, which is sufficient to meet the defrosting requirements of the electric damper; Since the rigid conductive plastic open square frame 2 is relatively brittle, its frame strip cross-sectional area should not be too large, otherwise it will increase the length of the frame strip, but it should not be too small either, otherwise it will be easy for the frame strip to break and be damaged. Since the perimeter L of the air vent of a frost-free refrigerator of the same capacity and model is fixed, the cross-sectional area S of the frame strip is calculated by the formula R=ρL / S (where R represents the resistance of the frame strip of length L, and S represents the cross-sectional area of the frame strip). For small-capacity frost-free refrigerators, the cross-sectional area S of the frame strips is relatively small. However, because a second collar 2-2-1, which matches and sleeves with the second protrusion 1-7, is provided in the middle of the second frame strip 2-2, and a second collar 2-3-1, which matches and sleeves with the third protrusion 1-8, is provided at the intersection of the third and fourth frame strips 2-3 and 2-4, the stability and anti-bending effect of the frame strips on the air vent frame are improved. When the cross-sectional area of the first and second connecting parts is 1.5 to 2 times larger than the cross-sectional area of the frame strips, calculations show that the effective resistance of the first and second connecting parts accounts for less than 3% of the resistance of the entire rigid conductive plastic open frame, and has a negligible impact on the defrosting effect near the air vent edge.
[0021] On an automated production line, a robotic arm places the rigid conductive plastic open frame 2 into the space of the damper frame 1 formed by the partition 1-5, the first protrusion 1-6, the first positioning pin 1-3, the second positioning pin 1-4, the rim 1-2, the second protrusion 1-7, and the third protrusion 1-8. Simultaneously, an umbrella-shaped barb is hot-pressed onto the upper part of the first protrusion 1-6, the second protrusion 1-7, and the third protrusion 1-8 using a hot-pressing device. The first protrusion 1-6 and its umbrella-shaped barb are used to fix the rigid conductive plastic open frame 2. The second protrusion 1-7, with the first collar 2-2-1 fitted, and its umbrella-shaped barb, and the third protrusion 1-8, with the second collar 2-3-1 fitted, are used for… The rigid conductive plastic open frame 2 is positioned and limited, and gaps are left between the first, second, third, and fourth frame segments 2-1, 2-2, 2-3, and 2-4 and the corresponding edge 1-2, the second protruding post 1-7 and its umbrella-shaped barb bottom plane, the third protruding post 1-8 and its umbrella-shaped barb bottom plane, as well as between the second protruding post 1-7 and the first collar 2-2-1, and between the third protruding post 1-8 and the second collar 2-3-1. These gaps are used to accommodate the thermal expansion and contraction of the rigid conductive plastic open frame 2 when it changes from -40℃ to +70℃, so as to ensure that the rigid conductive plastic open frame 2 will not be broken or move out of the defined position during operation.
[0022] The outer surface of the rigid conductive plastic opening frame 2 needs to be coated with an insulating varnish. Its function is to slow down the aging of conductive plastic in the humid environment inside the refrigerator and to prevent the conductive plastic from absorbing water and increasing its resistivity, which would cause a decrease in the electrical power of the rigid conductive plastic opening frame 2 and may seriously affect its defrosting effect.
[0023] The damper frame 1 equipped with the rigid conductive plastic open frame 2 was tested and verified: In the drop test, the damper frame 1 was dropped twice from a height of 1.2m in each of the X, Y, and Z directions onto a concrete surface. The rigid conductive plastic open frame 2 inside the damper frame 1 did not break or detach. This exceeds the requirements of the drop test specified in the national standard GB / T35720-2017.
Claims
1. A motorized air door for a forced air refrigerator, comprising an air door and an air door frame (1), a rectangular air opening (1-1) is arranged in the lower center of the air door frame (1), the air opening (1-1) is provided with a surrounding edge (1-2) composed of two opposite long surrounding edges (1-2-1) and two opposite short surrounding edges (1-2-2), and the air door is connected in matching contact with the top of the surrounding edge (1-2), characterized in that: The air door frame (1) beside the outer side of the short surrounding edge (1-2-2) of the upper end of the tuyere (1-1) is provided with a baffle (1-5), a vertically arranged cylindrical first protruding column (1-6), and a first positioning pin (1-3) and a second positioning pin (1-4) respectively located on both sides of the baffle (1-5); the air door frame (1) beside the outer side of the middle of the long surrounding edge (1-2-1) on the left side is provided with a vertically arranged cylindrical second protruding column (1-7); the air door frame (1) beside the intersection of the lower end of the long surrounding edge (1-2-1) and the right end of the lower short surrounding edge (1-2-2) on the right side is provided with a vertically arranged cylindrical third protruding column (1-8); a hard conductive plastic open square frame (2) that matches the shape of the surrounding edge (1-2) is arranged outside the surrounding edge (1-2); the open part of the hard conductive plastic open square frame (2) is provided with a first connecting part (2-5) with a first wiring terminal (3-1) and a second connecting part (2-6) with a second wiring terminal (3-2); the hard conductive plastic open square frame (2) is positioned and fixed in the cavity formed between the first protruding column (1-6), the second protruding column (1-7), the third protruding column (1-8), and the surrounding edge (1-2) by the first protruding column (1-6), the second protruding column (1-7), the third protruding column (1-8), the baffle (1-5), the first positioning pin (1-3), and the second positioning pin (1-4); the frame strips corresponding to the surrounding edge (1-2) are linear, and the middle of the second frame strip (2-2) is provided with a first sleeve ring (2-2-1) matched with the second protruding column (1-7), and the intersection of the third frame strip (2-3) and the fourth frame strip (2-4) is provided with a second sleeve ring (2-3-1) matched with the third protruding column (1-8); the hard conductive plastic open square frame (2) is integrally injection molded by conductive ABS plastic material.
2. The electric damper of the air-cooled refrigerator according to claim 1, characterized in that: The frame strips of the hard conductive plastic open square frame (2) are square strips, and the first connecting part (2-5) and the second connecting part (2-6) are both flat plates; the cross-sectional area of the first connecting part (2-5) and the second connecting part (2-6) is 1.5-2 times larger than the cross-sectional area of the frame strips of the hard conductive plastic open square frame (2).
3. The electric damper of the air-cooled refrigerator according to claim 1, characterized in that: The outer surface of the hard conductive plastic open square frame (2) is coated with a layer of insulating paint.